On the correlation between Broad-Band ELF wave power and ion fluxes in the cusp

Jacobsen, Knut Stanley; Moen, J.

doi:10.5194/angeo-28-1249-2010

Cited by 7 publications

(8 citation statements)

References 48 publications

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“…Numerous Cluster studies have shown that the low-frequency wave power correlates with the fluxes of the magnetosheath-like ions and electrons seen in the cusp (e.g., Duan et al, 2006;Grison et al, 2005;Jacobsen & Moen, 2010;Keith et al, 2005). Jacobsen and Moen (2010) pointed out that there is a greater degree of correlation between BBELF wave power and total fluxes in comparison with only field-aligned ion fluxes, suggesting that BBELF wave generation is independent of ion beam direction and therefore must be local.…”

Section: Low Frequency Wavesmentioning

confidence: 99%

The Polar Cusp Seen by Cluster

Pitout

Bogdanova

2021

JGR Space Physics

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The investigation of the magnetospheric polar cusps was one of the main objectives of the Cluster mission. The four satellites have crossed those regions numerous times over the years and, with their suitable instrumentation, favorable orbits, and unique multipoint measurements, many aspects of the cusp have been unveiled. The first of those is its highly dynamic nature. With four satellites, whatever their altitude and thus their configuration, the spatial/temporal ambiguity has been lifted and a completely new insight into the motion of the cusp and evolution of the transient small‐scale structures within it was given. Second, the high altitude or exterior cusp, its properties and dynamics, magnetic configuration, the energetic particles observed within, and its boundary with the magnetosheath were characterized in a number of case studies and on a statistical basis. Third, the Cluster cusp observations brought a fresh eye on the reconnection process at the magnetopause, including its location and spatio‐temporal variability. Finally, the complete payload with particle, field and wave detectors have made it possible to treat cusp as a plasma physics laboratory to progress our understanding of wave‐particle interaction and turbulence within the cusp. We have no choice but to note that Cluster has been extremely successful for all these matters.

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Section: Low Frequency Wavesmentioning

confidence: 99%

The Polar Cusp Seen by Cluster

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Bogdanova

2021

JGR Space Physics

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“…Broadband extremely low frequency (BBELF) fields are observed from the upper ionosphere to several R E out. BBELF refers to electromagnetic fluctuations from 3 to 5 kHz down to quasi-static levels Ivchenko and Marklund, 2001;Lorentzen et al, 2007;Jacobsen and Moen, 2010]. Lund et al [2000] mapped the occurrence rates of BBELF waves down to 1000 km altitude.…”

Section: Ion Upflow and Outflowmentioning

confidence: 99%

“…The first step is the initial acceleration of bulk ion upflow events driven by ion heating and ambipolar diffusion as observed by incoherent scatter radars (ISRs) [ Wahlund et al ., ; Ogawa et al ., , , ; Buchert et al ., ; Skjæveland et al ., ], sounding rockets [ Arnoldy et al ., ; Lynch et al ., ; Frederick‐Frost et al ., ], and satellites in polar low Earth orbit in the F region ionosphere [ Coley et al ., ; Ogawa et al ., ; Lühr et al ., ; Chaston et al ., ; Lorentzen et al ., ; Sadler et al ., ]. The second step is that upflow events that have reached sufficiently high altitudes are exposed to wave energies available in the topside ionosphere/magnetosphere which drive nonthermal transverse acceleration of oxygen [ André and Yau , ; Strangeway et al ., ; Chaston et al ., ; Jacobsen and Moen , ].…”

Section: Introductionmentioning

confidence: 99%

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Which cusp upflow events can possibly turn into outflows?

2014

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Two sequences, before and after magnetic noon, respectively, of poleward moving auroral forms with associated upflows situated above the European Incoherent Scatter Svalbard Radar allowed close study of ion upflow dynamics. We find that flux intensity is correlated with plasma temperature and that upflowing plasma undergoes acceleration proportional to the slope of the velocity profile and to the velocity at each altitude. The potential for upflows to lift thermal plasma to regions where broadband extremely low frequency electric field activity can cause nonthermal acceleration leading to outflow is examined. Equations for estimating the travel time of upflowing plasma are presented. We find that around 40% of the observed upflow profiles with a unit number flux greater than 1 × 10 13 m À2 s À1 can transport plasma from 500 to 800 km altitude in less than 10 min, approximately the typical lifetime of pulsed upflow events. Almost all such profiles can transport plasma from 600 to 800 km in the same time span. Typical transport times for other altitude ranges are also presented. Post magnetic noon the background electron density was somewhat higher than prenoon due to transport of EUV-enhanced plasma, and the postnoon ion flux was somewhat weaker than prenoon.

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“…44 The energization has been associated with enhanced broadband extra low frequency wave power in the frequency range between 1 Hz and 1 kHz (e.g., Refs. 36,42,and 45). However, the free energy source for the wave growth and the identification of the wave modes responsible for ion heating are still open issues.…”

Section: Introductionmentioning

confidence: 99%

Studies of small-scale plasma inhomogeneities in the cusp ionosphere using sounding rocket data

et al. 2018

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Microprocesses associated with plasma inhomogeneities are studied on the basis of data from the Investigation of Cusp Irregularities (ICI-3) sounding rocket. The ICI-3 rocket is devoted to investigating a reverse flow event in the cusp F region ionosphere. By numerical stability analysis, it is demonstrated that inhomogeneous-energy-density-driven (IEDD) instability can be a mechanism for the excitation of small-scale plasma inhomogeneities. The Local Intermittency Measure (LIM) method also applied the rocket data to analyze irregular structures of the electric field during rocket flight in the cusp. A qualitative agreement between high values of the growth rates of the IEDD instability and the regions with enhanced LIM is observed. This suggests that IEDD instability is connected to turbulent non-Gaussian processes.

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On the correlation between Broad-Band ELF wave power and ion fluxes in the cusp

Cited by 7 publications

References 48 publications

The Polar Cusp Seen by Cluster

The Polar Cusp Seen by Cluster

Which cusp upflow events can possibly turn into outflows?

Studies of small-scale plasma inhomogeneities in the cusp ionosphere using sounding rocket data

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